/*
 * Copyright 2020 gRPC authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.grpc.examples.helloworld

import io.grpc.Server
import io.grpc.ServerBuilder

class HelloWorldServer constructor(
    private val port: Int
) {
  val server: Server = ServerBuilder
      .forPort(port)
      .addService(HelloWorldService())
      .build()

  fun start() {
    server.start()
    println("Server started, listening on $port")
    Runtime.getRuntime().addShutdownHook(
        Thread {
          println("*** shutting down gRPC server since JVM is shutting down")
          this@HelloWorldServer.stop()
          println("*** server shut down")
        }
    )
  }

  private fun stop() {
    server.shutdown()
  }

  fun blockUntilShutdown() {
    server.awaitTermination()
  }

  private class HelloWorldService : GreeterGrpcKt.GreeterCoroutineImplBase() {
    override suspend fun sayHello(request: HelloRequest) = HelloReply
        .newBuilder()
        .setMessage("Hello ${request.name}")
        .build()
  }
}

fun main() {
  val port = 50051
  val server = HelloWorldServer(port)
  server.start()
  server.blockUntilShutdown()
}
